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铁道科学与工程学报

JOURNAL OF RAILWAY SCIENCE AND ENGINEERING

第11卷    第4期    总第60期    2014年8月

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文章编号:1672-7029(2014)04-0073-07
盾构隧道施工对既有建筑物基桩影响的数值模拟
王净伟1,2,杨信之3,阮波1

(1. 中南大学 土木工程学院,湖南 长沙 410075; 
2. 中铁上海设计院集团有限公司 天津分院,天津 300073;
3. 湖南省有色地质测试研究中心,湖南 长沙 410071
)

摘 要: 针对地铁隧道常用的盾构开挖方式,在考虑开挖面扰动、土仓压力、盾壳与土层间的摩擦力以及注浆层对地表沉降影响的基础上,对盾构隧道的施工过程进行数值模拟,研究盾构隧道开挖对邻近基桩的影响规律。结果表明:在隧道轴线方向,盾构开挖对基桩的影响范围大约为基桩前方20 m至后方25 m;盾构开挖引起的桩身附加轴力随着埋深的增加而增大,在隧道埋深处达到最大值;盾构开挖引起的基桩弯矩随着开挖面与基桩间距离的减小而逐渐增大,开挖至基桩位置时,垂直于隧道轴线方向的弯矩达到最大值。

 

关键字: 地铁隧道;盾构;数值分析;地表沉降;桩基;轴力;弯矩

Numerical simulation of shield tunnel construction on the impact of neighboring piles foundation
WANG Jingwei1,2, YANG Xinzhi3, RUAN Bo1

1.School of Civil Engineering, Central South University, Changsha 410075, China;
2. China Railway Shanghai Design Institute Group Co., Ltd. Tianjin Branch, Tianjin 300073, China;
3. Hunan Nonferrous Geological Testing Center, Changsha 410071, China

Abstract:As for the common shield excavation technique in subway, the influence of shield excavation on piles foundation was estimated with the simulation calculation for construction process by taking into account the disturbance of the excavation face, the pressure of soil chamber, the friction and grouting layer between the shield and the soil. The results indicate that the affecting area of surface subsidence caused by shield excavation is approximately from 20m in front of foundation piles to 25m behind the excavation face in the direction of tunnel axis. The pile additional axial force induced by the shield excavation increases with the increase of buried depth and reaches the maximum in the depth of the tunnel. However, the moment of pile increases because of the shield excavation, which grows continually with the reduced distance between excavation face and pile. The moment perpendicular to the tunnel axis direction approaches to the maximum value when excavating to the pile position.

 

Key words: subway tunnel; shield; numerical analysis; ground subsidence; pile foundation; axial force; bending moment

ISSN 1672-7029
CN 43-1423/U

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